Continuous and filter-based measurements of PM 2.5 nitrate and sulfate at the Fresno Supersite
Chow, JC; Watson, JG; Lowenthal, DH; Park, K; Doraiswamy, P; Bowers, K; Bode, R
HERO ID
835403
Reference Type
Journal Article
Year
2008
Language
English
PMID
| HERO ID | 835403 |
|---|---|
| In Press | No |
| Year | 2008 |
| Title | Continuous and filter-based measurements of PM 2.5 nitrate and sulfate at the Fresno Supersite |
| Authors | Chow, JC; Watson, JG; Lowenthal, DH; Park, K; Doraiswamy, P; Bowers, K; Bode, R |
| Journal | Environmental Monitoring and Assessment |
| Volume | 144 |
| Issue | 1-3 |
| Page Numbers | 179-189 |
| Abstract | PM(2.5) nitrate (NO-(3)) and sulfate (SO=(4)) were measured continuously with R&P8400N and R&P8400S instruments, respectively, and compared with filter-based measurements at the Fresno Supersite from October, 2000 through December, 2005. NO-(3) concentrations were higher in winter than summer with a long-term decreasing trend. Correlations between 24-h average continuous and filter-based NO-(3) were greater than 0.96 in 4 out of 5 years. Continuous NO-(3) was generally lower than filter-based NO-(3) although the difference decreased over time, from -52% in 2001 to +13% in 2005. These differences were similar in winter (-23%) and summer (-19%) while the corresponding differences between ambient and instrument temperature were -12 and 0.7 degrees C, respectively. Neither seasonal nor long-term trends in NO-(3) can be explained by variations in ambient temperature, the difference between ambient and instrument temperature, or changes in aerosol chemical composition. There were no seasonal or long-term trends in SO=(4) concentrations, partially due to low concentrations observed in Fresno. Long-term variability in the performance of R&P8400 NO-(3) and SO=(4) instruments suggest that collocation with filter measurements is needed for long-term measurements. |
| Doi | 10.1007/s10661-007-9987-5 |
| Pmid | 17929182 |
| Wosid | WOS:000258781700017 |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Source: Web of Science WOS:000258781700017 |
| Is Public | Yes |
| Language Text | English |
| Keyword | PM2.5; nitrate-sulfate; supersite |
| Is Qa | No |